1 /* Copyright (c) 2008, 2009 Nicira Networks, Inc.
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 3 of the License, or
6 * (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 * In addition, as a special exception, Nicira Networks gives permission
17 * to link the code of its release of vswitchd with the OpenSSL project's
18 * "OpenSSL" library (or with modified versions of it that use the same
19 * license as the "OpenSSL" library), and distribute the linked
20 * executables. You must obey the GNU General Public License in all
21 * respects for all of the code used other than "OpenSSL". If you modify
22 * this file, you may extend this exception to your version of the file,
23 * but you are not obligated to do so. If you do not wish to do so,
24 * delete this exception statement from your version.
35 /* Maximum number of bytes in a byteq. */
36 #define BYTEQ_SIZE 512
38 /* General-purpose circular queue of bytes. */
40 uint8_t buffer[BYTEQ_SIZE]; /* Circular queue. */
41 unsigned int head; /* Head of queue. */
42 unsigned int tail; /* Chases the head. */
45 void byteq_init(struct byteq *);
46 int byteq_used(const struct byteq *);
47 int byteq_avail(const struct byteq *);
48 bool byteq_is_empty(const struct byteq *);
49 bool byteq_is_full(const struct byteq *);
50 void byteq_put(struct byteq *, uint8_t c);
51 void byteq_putn(struct byteq *, const void *, size_t n);
52 void byteq_put_string(struct byteq *, const char *);
53 uint8_t byteq_get(struct byteq *);
54 int byteq_write(struct byteq *, int fd);
55 int byteq_read(struct byteq *, int fd);